Resumen de Simulating the Effects of the Alternative Vote in the 2010 UK General Election

David Sanders, Harold D. Clarke, Marianne C. Stewart, Paul Whiteley

• The Conservative/Liberal Democrat Coalition government has announced its intention to hold a referendum on the possible introduction of the Alternative Vote (AV) for future elections to the House of Commons. This paper uses survey data from the 2010 British Election Study to simulate what the effects on the seat distribution in the House of Commons would have been if AV had operated in May 2010. The results suggest an outcome for the three main parties of Conservatives 284, Labour 248 and Liberal Democrats 89. This outcome would have radically changed the arithmetic of post-election coalition building, with the Liberal Democrats being able to form a majority coalition with either Labour or the Conservatives.